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Nursery sowing is starting seeds in a protected nursery area (like a seedbed, trays, greenhouse, or shade setup) so they germinate and grow into young seedlings under controlled conditions. After they’re strong enough, the seedlings are transplanted to their final growing location (field or garden).

It’s commonly used to improve survival rate and uniformity of plants, especially for crops that are sensitive when young.

I’m not sure what you mean by “planting agent” (a person/worker, an app, or software). If you mean an automated tool that helps you create a tomato planting plan, tell me which one you’re using.

In the meantime, here are two common ways “new” tomato plants get created:

1) From seeds (nursery sowing)
- Sow tomato seeds in a nursery/tray (seedling mix, keep warm and lightly moist).
- When seedlings have a couple sets of true leaves (typically ~4–6 weeks), harden them off for a few days.
- Transplant into your garden/containers.

2) From seedlings (buy or raise)
- Buy nursery-grown seedlings, or grow your own as above.
- Plant them after the last frost / when nights are warm.

If you tell me your location (or climate: “hot/humid” vs “cool” + frost dates) and whether you want in-ground or containers, I can give you a simple step-by-step schedule.